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When your CNC router, 3D printer, or robotic arm demands repeatable, low-backlash power transmission, the wrong gear wastes hours of calibration and risks costly crashes. Engineers, makers, and small-batch manufacturers who need a reliable module 1 spur gear with a wide tooth and bore selection can stop searching — this aluminium pinion gear series covers the full range in one listing.
Each gear is machined from aluminium alloy and features a Module 1 (1 mm/tooth) tooth profile. Tooth counts span 12 to 60 teeth, and bore sizes range from 4 mm (0.16 in) to 16 mm (0.63 in). Larger tooth counts (40 T and above) are available with an extended hub in either 25 mm or 35 mm hub length to suit deeper shaft engagement requirements. Overall gear diameter scales with tooth count: a 12-tooth gear measures approximately 14 mm (0.55 in) OD, while a 60-tooth gear reaches approximately 62 mm (2.44 in) OD.
Typical use cases include stepper-motor pinion drives on desktop CNC machines, rack-and-pinion linear actuators for automation fixtures, and gear-train assemblies in educational robotics kits. The consistent module 1 pitch makes these gears interchangeable with standard metric rack, worm, and mating spur gears used in open-source motion-control platforms.
Choose from 23 tooth-count options — from compact 12-tooth pinions to large 60-tooth gears — to dial in your exact gear ratio without custom machining.
Ten bore options (4, 5, 6, 7, 8, 10, 12, 14, 15, 16 mm) cover the most common stepper and servo motor shaft diameters, eliminating the need for bushings in most builds.
Machined from lightweight aluminium alloy, these gears offer a strong strength-to-weight ratio suitable for moderate-load motion-control applications where reducing rotating mass matters.
The 1 mm/tooth module pitch is fully interchangeable with any metric Module 1 rack, mating spur gear, or worm gear — no custom tooling or adapters required.
40 T, 50 T, and 60 T models are available with 25 mm or 35 mm hub lengths, providing extra shaft contact area for higher-torque or vibration-prone environments.
Consistent Module 1 geometry makes these gears direct replacements in RepRap-derived 3D printers, GRBL CNC routers, and other open-source automation platforms that specify metric module gearing.
| Module | 1 (1 mm per tooth) |
|---|---|
| Tooth Count Range | 12 T – 60 T (see variant options) |
| Bore Size Range | 4 mm – 16 mm (see variant options) |
| Material | Aluminium alloy |
| Pressure Angle | 20° (standard metric) |
| Outer Diameter (OD) | See variant options (scales with tooth count) |
| Hub Length | See variant options (25 mm or 35 mm for 40 T+) |
| Finish | Natural aluminium (uncoated) |
| Gear Type | Spur gear (straight tooth) |
| Pitch Diameter | = Tooth Count × 1 mm (Module 1 formula) |
| Weight | See variant options |
Select your tooth count based on the gear ratio you need. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 20-tooth motor pinion with a 60-tooth output gear gives a 3:1 reduction. Smaller tooth counts produce higher speed; larger tooth counts produce more torque.
Match the bore size to your motor shaft diameter. NEMA 17 motors typically use 5 mm shafts; NEMA 23 motors commonly use 6.35 mm or 8 mm shafts. If your shaft has a flat (D-cut), you will need to add a set screw after installation — check that the gear body has a set-screw hole or plan to drill and tap one.
Aluminium alloy spur gears are well-suited for light-to-moderate load applications such as desktop CNC routers, 3D printer extruder drives, and small robotic joints. For heavy industrial loads or continuous high-torque duty cycles, consider steel gears instead. If you are unsure, share your torque and speed requirements and we can advise.
Aluminium has natural oxidation resistance suitable for indoor, dry environments. For longer service life and quieter operation, apply a light machine oil or dry PTFE lubricant to the tooth faces. Avoid exposing aluminium gears to salt spray or strong acids without additional protective coating.
Yes. Any gear in this listing will mesh correctly with a standard Module 1 metric rack or a mating Module 1 spur gear. The 20° pressure angle is the international standard for metric module gearing, ensuring interchangeability across brands and suppliers.
The hub length refers to the depth of the bore section that grips the shaft. A 35 mm hub provides more shaft contact area, which improves torque transfer and reduces wobble under load — useful in higher-torque or vibration-prone applications. The 25 mm hub is lighter and more compact, suitable for standard motion-control builds.
Yes, provided your existing gears are Module 1 metric. Measure the tooth count and bore diameter of the worn gear, then select the matching variant. If you are unsure of the module, measure the outer diameter in mm and divide by (tooth count + 2) — a result close to 1.0 confirms Module 1.
